2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/fsnotify.h>
25 #include <linux/pagemap.h>
26 #include <linux/highmem.h>
27 #include <linux/time.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/backing-dev.h>
31 #include <linux/mount.h>
32 #include <linux/mpage.h>
33 #include <linux/namei.h>
34 #include <linux/swap.h>
35 #include <linux/writeback.h>
36 #include <linux/statfs.h>
37 #include <linux/compat.h>
38 #include <linux/bit_spinlock.h>
39 #include <linux/security.h>
40 #include <linux/xattr.h>
41 #include <linux/vmalloc.h>
42 #include <linux/slab.h>
43 #include <linux/blkdev.h>
47 #include "transaction.h"
48 #include "btrfs_inode.h"
50 #include "print-tree.h"
54 /* Mask out flags that are inappropriate for the given type of inode. */
55 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
59 else if (S_ISREG(mode
))
60 return flags
& ~FS_DIRSYNC_FL
;
62 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
66 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
68 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
70 unsigned int iflags
= 0;
72 if (flags
& BTRFS_INODE_SYNC
)
74 if (flags
& BTRFS_INODE_IMMUTABLE
)
75 iflags
|= FS_IMMUTABLE_FL
;
76 if (flags
& BTRFS_INODE_APPEND
)
77 iflags
|= FS_APPEND_FL
;
78 if (flags
& BTRFS_INODE_NODUMP
)
79 iflags
|= FS_NODUMP_FL
;
80 if (flags
& BTRFS_INODE_NOATIME
)
81 iflags
|= FS_NOATIME_FL
;
82 if (flags
& BTRFS_INODE_DIRSYNC
)
83 iflags
|= FS_DIRSYNC_FL
;
84 if (flags
& BTRFS_INODE_NODATACOW
)
85 iflags
|= FS_NOCOW_FL
;
87 if ((flags
& BTRFS_INODE_COMPRESS
) && !(flags
& BTRFS_INODE_NOCOMPRESS
))
88 iflags
|= FS_COMPR_FL
;
89 else if (flags
& BTRFS_INODE_NOCOMPRESS
)
90 iflags
|= FS_NOCOMP_FL
;
96 * Update inode->i_flags based on the btrfs internal flags.
98 void btrfs_update_iflags(struct inode
*inode
)
100 struct btrfs_inode
*ip
= BTRFS_I(inode
);
102 inode
->i_flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
104 if (ip
->flags
& BTRFS_INODE_SYNC
)
105 inode
->i_flags
|= S_SYNC
;
106 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
107 inode
->i_flags
|= S_IMMUTABLE
;
108 if (ip
->flags
& BTRFS_INODE_APPEND
)
109 inode
->i_flags
|= S_APPEND
;
110 if (ip
->flags
& BTRFS_INODE_NOATIME
)
111 inode
->i_flags
|= S_NOATIME
;
112 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
113 inode
->i_flags
|= S_DIRSYNC
;
117 * Inherit flags from the parent inode.
119 * Unlike extN we don't have any flags we don't want to inherit currently.
121 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
128 flags
= BTRFS_I(dir
)->flags
;
130 if (S_ISREG(inode
->i_mode
))
131 flags
&= ~BTRFS_INODE_DIRSYNC
;
132 else if (!S_ISDIR(inode
->i_mode
))
133 flags
&= (BTRFS_INODE_NODUMP
| BTRFS_INODE_NOATIME
);
135 BTRFS_I(inode
)->flags
= flags
;
136 btrfs_update_iflags(inode
);
139 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
141 struct btrfs_inode
*ip
= BTRFS_I(file
->f_path
.dentry
->d_inode
);
142 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
144 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
149 static int check_flags(unsigned int flags
)
151 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
152 FS_NOATIME_FL
| FS_NODUMP_FL
| \
153 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
154 FS_NOCOMP_FL
| FS_COMPR_FL
|
158 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
164 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
166 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
167 struct btrfs_inode
*ip
= BTRFS_I(inode
);
168 struct btrfs_root
*root
= ip
->root
;
169 struct btrfs_trans_handle
*trans
;
170 unsigned int flags
, oldflags
;
173 if (btrfs_root_readonly(root
))
176 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
179 ret
= check_flags(flags
);
183 if (!is_owner_or_cap(inode
))
186 mutex_lock(&inode
->i_mutex
);
188 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
189 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
190 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
191 if (!capable(CAP_LINUX_IMMUTABLE
)) {
197 ret
= mnt_want_write(file
->f_path
.mnt
);
201 if (flags
& FS_SYNC_FL
)
202 ip
->flags
|= BTRFS_INODE_SYNC
;
204 ip
->flags
&= ~BTRFS_INODE_SYNC
;
205 if (flags
& FS_IMMUTABLE_FL
)
206 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
208 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
209 if (flags
& FS_APPEND_FL
)
210 ip
->flags
|= BTRFS_INODE_APPEND
;
212 ip
->flags
&= ~BTRFS_INODE_APPEND
;
213 if (flags
& FS_NODUMP_FL
)
214 ip
->flags
|= BTRFS_INODE_NODUMP
;
216 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
217 if (flags
& FS_NOATIME_FL
)
218 ip
->flags
|= BTRFS_INODE_NOATIME
;
220 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
221 if (flags
& FS_DIRSYNC_FL
)
222 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
224 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
225 if (flags
& FS_NOCOW_FL
)
226 ip
->flags
|= BTRFS_INODE_NODATACOW
;
228 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
231 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
232 * flag may be changed automatically if compression code won't make
235 if (flags
& FS_NOCOMP_FL
) {
236 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
237 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
238 } else if (flags
& FS_COMPR_FL
) {
239 ip
->flags
|= BTRFS_INODE_COMPRESS
;
240 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
242 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
245 trans
= btrfs_join_transaction(root
, 1);
246 BUG_ON(IS_ERR(trans
));
248 ret
= btrfs_update_inode(trans
, root
, inode
);
251 btrfs_update_iflags(inode
);
252 inode
->i_ctime
= CURRENT_TIME
;
253 btrfs_end_transaction(trans
, root
);
255 mnt_drop_write(file
->f_path
.mnt
);
259 mutex_unlock(&inode
->i_mutex
);
263 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
265 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
267 return put_user(inode
->i_generation
, arg
);
270 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
272 struct btrfs_root
*root
= fdentry(file
)->d_sb
->s_fs_info
;
273 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
274 struct btrfs_device
*device
;
275 struct request_queue
*q
;
276 struct fstrim_range range
;
277 u64 minlen
= ULLONG_MAX
;
281 if (!capable(CAP_SYS_ADMIN
))
284 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
285 list_for_each_entry(device
, &fs_info
->fs_devices
->devices
, dev_list
) {
288 q
= bdev_get_queue(device
->bdev
);
289 if (blk_queue_discard(q
)) {
291 minlen
= min((u64
)q
->limits
.discard_granularity
,
295 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
299 if (copy_from_user(&range
, arg
, sizeof(range
)))
302 range
.minlen
= max(range
.minlen
, minlen
);
303 ret
= btrfs_trim_fs(root
, &range
);
307 if (copy_to_user(arg
, &range
, sizeof(range
)))
313 static noinline
int create_subvol(struct btrfs_root
*root
,
314 struct dentry
*dentry
,
315 char *name
, int namelen
,
318 struct btrfs_trans_handle
*trans
;
319 struct btrfs_key key
;
320 struct btrfs_root_item root_item
;
321 struct btrfs_inode_item
*inode_item
;
322 struct extent_buffer
*leaf
;
323 struct btrfs_root
*new_root
;
324 struct dentry
*parent
= dget_parent(dentry
);
329 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
332 ret
= btrfs_find_free_objectid(NULL
, root
->fs_info
->tree_root
,
339 dir
= parent
->d_inode
;
347 trans
= btrfs_start_transaction(root
, 6);
350 return PTR_ERR(trans
);
353 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
354 0, objectid
, NULL
, 0, 0, 0);
360 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
361 btrfs_set_header_bytenr(leaf
, leaf
->start
);
362 btrfs_set_header_generation(leaf
, trans
->transid
);
363 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
364 btrfs_set_header_owner(leaf
, objectid
);
366 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
367 (unsigned long)btrfs_header_fsid(leaf
),
369 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
370 (unsigned long)btrfs_header_chunk_tree_uuid(leaf
),
372 btrfs_mark_buffer_dirty(leaf
);
374 inode_item
= &root_item
.inode
;
375 memset(inode_item
, 0, sizeof(*inode_item
));
376 inode_item
->generation
= cpu_to_le64(1);
377 inode_item
->size
= cpu_to_le64(3);
378 inode_item
->nlink
= cpu_to_le32(1);
379 inode_item
->nbytes
= cpu_to_le64(root
->leafsize
);
380 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
383 root_item
.byte_limit
= 0;
384 inode_item
->flags
= cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT
);
386 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
387 btrfs_set_root_generation(&root_item
, trans
->transid
);
388 btrfs_set_root_level(&root_item
, 0);
389 btrfs_set_root_refs(&root_item
, 1);
390 btrfs_set_root_used(&root_item
, leaf
->len
);
391 btrfs_set_root_last_snapshot(&root_item
, 0);
393 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
394 root_item
.drop_level
= 0;
396 btrfs_tree_unlock(leaf
);
397 free_extent_buffer(leaf
);
400 btrfs_set_root_dirid(&root_item
, new_dirid
);
402 key
.objectid
= objectid
;
404 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
405 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
410 key
.offset
= (u64
)-1;
411 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
412 BUG_ON(IS_ERR(new_root
));
414 btrfs_record_root_in_trans(trans
, new_root
);
416 ret
= btrfs_create_subvol_root(trans
, new_root
, new_dirid
,
417 BTRFS_I(dir
)->block_group
);
419 * insert the directory item
421 ret
= btrfs_set_inode_index(dir
, &index
);
424 ret
= btrfs_insert_dir_item(trans
, root
,
425 name
, namelen
, dir
->i_ino
, &key
,
426 BTRFS_FT_DIR
, index
);
430 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
431 ret
= btrfs_update_inode(trans
, root
, dir
);
434 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
435 objectid
, root
->root_key
.objectid
,
436 dir
->i_ino
, index
, name
, namelen
);
440 d_instantiate(dentry
, btrfs_lookup_dentry(dir
, dentry
));
444 *async_transid
= trans
->transid
;
445 err
= btrfs_commit_transaction_async(trans
, root
, 1);
447 err
= btrfs_commit_transaction(trans
, root
);
454 static int create_snapshot(struct btrfs_root
*root
, struct dentry
*dentry
,
455 char *name
, int namelen
, u64
*async_transid
,
459 struct dentry
*parent
;
460 struct btrfs_pending_snapshot
*pending_snapshot
;
461 struct btrfs_trans_handle
*trans
;
467 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
468 if (!pending_snapshot
)
471 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
);
472 pending_snapshot
->dentry
= dentry
;
473 pending_snapshot
->root
= root
;
474 pending_snapshot
->readonly
= readonly
;
476 trans
= btrfs_start_transaction(root
->fs_info
->extent_root
, 5);
478 ret
= PTR_ERR(trans
);
482 ret
= btrfs_snap_reserve_metadata(trans
, pending_snapshot
);
485 list_add(&pending_snapshot
->list
,
486 &trans
->transaction
->pending_snapshots
);
488 *async_transid
= trans
->transid
;
489 ret
= btrfs_commit_transaction_async(trans
,
490 root
->fs_info
->extent_root
, 1);
492 ret
= btrfs_commit_transaction(trans
,
493 root
->fs_info
->extent_root
);
497 ret
= pending_snapshot
->error
;
501 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
505 parent
= dget_parent(dentry
);
506 inode
= btrfs_lookup_dentry(parent
->d_inode
, dentry
);
509 ret
= PTR_ERR(inode
);
513 d_instantiate(dentry
, inode
);
516 kfree(pending_snapshot
);
520 /* copy of check_sticky in fs/namei.c()
521 * It's inline, so penalty for filesystems that don't use sticky bit is
524 static inline int btrfs_check_sticky(struct inode
*dir
, struct inode
*inode
)
526 uid_t fsuid
= current_fsuid();
528 if (!(dir
->i_mode
& S_ISVTX
))
530 if (inode
->i_uid
== fsuid
)
532 if (dir
->i_uid
== fsuid
)
534 return !capable(CAP_FOWNER
);
537 /* copy of may_delete in fs/namei.c()
538 * Check whether we can remove a link victim from directory dir, check
539 * whether the type of victim is right.
540 * 1. We can't do it if dir is read-only (done in permission())
541 * 2. We should have write and exec permissions on dir
542 * 3. We can't remove anything from append-only dir
543 * 4. We can't do anything with immutable dir (done in permission())
544 * 5. If the sticky bit on dir is set we should either
545 * a. be owner of dir, or
546 * b. be owner of victim, or
547 * c. have CAP_FOWNER capability
548 * 6. If the victim is append-only or immutable we can't do antyhing with
549 * links pointing to it.
550 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
551 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
552 * 9. We can't remove a root or mountpoint.
553 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
554 * nfs_async_unlink().
557 static int btrfs_may_delete(struct inode
*dir
,struct dentry
*victim
,int isdir
)
561 if (!victim
->d_inode
)
564 BUG_ON(victim
->d_parent
->d_inode
!= dir
);
565 audit_inode_child(victim
, dir
);
567 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
572 if (btrfs_check_sticky(dir
, victim
->d_inode
)||
573 IS_APPEND(victim
->d_inode
)||
574 IS_IMMUTABLE(victim
->d_inode
) || IS_SWAPFILE(victim
->d_inode
))
577 if (!S_ISDIR(victim
->d_inode
->i_mode
))
581 } else if (S_ISDIR(victim
->d_inode
->i_mode
))
585 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
590 /* copy of may_create in fs/namei.c() */
591 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
597 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
601 * Create a new subvolume below @parent. This is largely modeled after
602 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
603 * inside this filesystem so it's quite a bit simpler.
605 static noinline
int btrfs_mksubvol(struct path
*parent
,
606 char *name
, int namelen
,
607 struct btrfs_root
*snap_src
,
608 u64
*async_transid
, bool readonly
)
610 struct inode
*dir
= parent
->dentry
->d_inode
;
611 struct dentry
*dentry
;
614 mutex_lock_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
616 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
617 error
= PTR_ERR(dentry
);
625 error
= mnt_want_write(parent
->mnt
);
629 error
= btrfs_may_create(dir
, dentry
);
633 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
635 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
639 error
= create_snapshot(snap_src
, dentry
,
640 name
, namelen
, async_transid
, readonly
);
642 error
= create_subvol(BTRFS_I(dir
)->root
, dentry
,
643 name
, namelen
, async_transid
);
646 fsnotify_mkdir(dir
, dentry
);
648 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
650 mnt_drop_write(parent
->mnt
);
654 mutex_unlock(&dir
->i_mutex
);
658 static int should_defrag_range(struct inode
*inode
, u64 start
, u64 len
,
659 int thresh
, u64
*last_len
, u64
*skip
,
662 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
663 struct extent_map
*em
= NULL
;
664 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
672 * make sure that once we start defragging and extent, we keep on
675 if (start
< *defrag_end
)
681 * hopefully we have this extent in the tree already, try without
682 * the full extent lock
684 read_lock(&em_tree
->lock
);
685 em
= lookup_extent_mapping(em_tree
, start
, len
);
686 read_unlock(&em_tree
->lock
);
689 /* get the big lock and read metadata off disk */
690 lock_extent(io_tree
, start
, start
+ len
- 1, GFP_NOFS
);
691 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
692 unlock_extent(io_tree
, start
, start
+ len
- 1, GFP_NOFS
);
698 /* this will cover holes, and inline extents */
699 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
)
703 * we hit a real extent, if it is big don't bother defragging it again
705 if ((*last_len
== 0 || *last_len
>= thresh
) && em
->len
>= thresh
)
709 * last_len ends up being a counter of how many bytes we've defragged.
710 * every time we choose not to defrag an extent, we reset *last_len
711 * so that the next tiny extent will force a defrag.
713 * The end result of this is that tiny extents before a single big
714 * extent will force at least part of that big extent to be defragged.
718 *defrag_end
= extent_map_end(em
);
721 *skip
= extent_map_end(em
);
729 static int btrfs_defrag_file(struct file
*file
,
730 struct btrfs_ioctl_defrag_range_args
*range
)
732 struct inode
*inode
= fdentry(file
)->d_inode
;
733 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
734 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
735 struct btrfs_ordered_extent
*ordered
;
737 struct btrfs_super_block
*disk_super
;
738 unsigned long last_index
;
739 unsigned long ra_pages
= root
->fs_info
->bdi
.ra_pages
;
740 unsigned long total_read
= 0;
749 int compress_type
= BTRFS_COMPRESS_ZLIB
;
751 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
752 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
754 if (range
->compress_type
)
755 compress_type
= range
->compress_type
;
758 if (inode
->i_size
== 0)
761 if (range
->start
+ range
->len
> range
->start
) {
762 last_index
= min_t(u64
, inode
->i_size
- 1,
763 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
765 last_index
= (inode
->i_size
- 1) >> PAGE_CACHE_SHIFT
;
768 i
= range
->start
>> PAGE_CACHE_SHIFT
;
769 while (i
<= last_index
) {
770 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
772 range
->extent_thresh
,
777 * the should_defrag function tells us how much to skip
778 * bump our counter by the suggested amount
780 next
= (skip
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
781 i
= max(i
+ 1, next
);
785 if (total_read
% ra_pages
== 0) {
786 btrfs_force_ra(inode
->i_mapping
, &file
->f_ra
, file
, i
,
787 min(last_index
, i
+ ra_pages
- 1));
790 mutex_lock(&inode
->i_mutex
);
791 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
792 BTRFS_I(inode
)->force_compress
= compress_type
;
794 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
798 if (inode
->i_size
== 0 ||
799 i
> ((inode
->i_size
- 1) >> PAGE_CACHE_SHIFT
)) {
801 goto err_reservations
;
804 page
= grab_cache_page(inode
->i_mapping
, i
);
807 goto err_reservations
;
810 if (!PageUptodate(page
)) {
811 btrfs_readpage(NULL
, page
);
813 if (!PageUptodate(page
)) {
815 page_cache_release(page
);
817 goto err_reservations
;
821 if (page
->mapping
!= inode
->i_mapping
) {
823 page_cache_release(page
);
827 wait_on_page_writeback(page
);
829 if (PageDirty(page
)) {
830 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
834 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
835 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
836 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
838 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
840 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
842 page_cache_release(page
);
843 btrfs_start_ordered_extent(inode
, ordered
, 1);
844 btrfs_put_ordered_extent(ordered
);
847 set_page_extent_mapped(page
);
850 * this makes sure page_mkwrite is called on the
851 * page if it is dirtied again later
853 clear_page_dirty_for_io(page
);
854 clear_extent_bits(&BTRFS_I(inode
)->io_tree
, page_start
,
855 page_end
, EXTENT_DIRTY
| EXTENT_DELALLOC
|
856 EXTENT_DO_ACCOUNTING
, GFP_NOFS
);
858 btrfs_set_extent_delalloc(inode
, page_start
, page_end
, NULL
);
859 ClearPageChecked(page
);
860 set_page_dirty(page
);
861 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
865 page_cache_release(page
);
866 mutex_unlock(&inode
->i_mutex
);
868 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
872 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
))
873 filemap_flush(inode
->i_mapping
);
875 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
876 /* the filemap_flush will queue IO into the worker threads, but
877 * we have to make sure the IO is actually started and that
878 * ordered extents get created before we return
880 atomic_inc(&root
->fs_info
->async_submit_draining
);
881 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
882 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
883 wait_event(root
->fs_info
->async_submit_wait
,
884 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
885 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
887 atomic_dec(&root
->fs_info
->async_submit_draining
);
889 mutex_lock(&inode
->i_mutex
);
890 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
891 mutex_unlock(&inode
->i_mutex
);
894 disk_super
= &root
->fs_info
->super_copy
;
895 features
= btrfs_super_incompat_flags(disk_super
);
896 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
897 features
|= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO
;
898 btrfs_set_super_incompat_flags(disk_super
, features
);
904 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
906 mutex_unlock(&inode
->i_mutex
);
910 static noinline
int btrfs_ioctl_resize(struct btrfs_root
*root
,
916 struct btrfs_ioctl_vol_args
*vol_args
;
917 struct btrfs_trans_handle
*trans
;
918 struct btrfs_device
*device
= NULL
;
924 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
927 if (!capable(CAP_SYS_ADMIN
))
930 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
931 if (IS_ERR(vol_args
))
932 return PTR_ERR(vol_args
);
934 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
936 mutex_lock(&root
->fs_info
->volume_mutex
);
937 sizestr
= vol_args
->name
;
938 devstr
= strchr(sizestr
, ':');
941 sizestr
= devstr
+ 1;
943 devstr
= vol_args
->name
;
944 devid
= simple_strtoull(devstr
, &end
, 10);
945 printk(KERN_INFO
"resizing devid %llu\n",
946 (unsigned long long)devid
);
948 device
= btrfs_find_device(root
, devid
, NULL
, NULL
);
950 printk(KERN_INFO
"resizer unable to find device %llu\n",
951 (unsigned long long)devid
);
955 if (!strcmp(sizestr
, "max"))
956 new_size
= device
->bdev
->bd_inode
->i_size
;
958 if (sizestr
[0] == '-') {
961 } else if (sizestr
[0] == '+') {
965 new_size
= memparse(sizestr
, NULL
);
972 old_size
= device
->total_bytes
;
975 if (new_size
> old_size
) {
979 new_size
= old_size
- new_size
;
980 } else if (mod
> 0) {
981 new_size
= old_size
+ new_size
;
984 if (new_size
< 256 * 1024 * 1024) {
988 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
993 do_div(new_size
, root
->sectorsize
);
994 new_size
*= root
->sectorsize
;
996 printk(KERN_INFO
"new size for %s is %llu\n",
997 device
->name
, (unsigned long long)new_size
);
999 if (new_size
> old_size
) {
1000 trans
= btrfs_start_transaction(root
, 0);
1001 if (IS_ERR(trans
)) {
1002 ret
= PTR_ERR(trans
);
1005 ret
= btrfs_grow_device(trans
, device
, new_size
);
1006 btrfs_commit_transaction(trans
, root
);
1008 ret
= btrfs_shrink_device(device
, new_size
);
1012 mutex_unlock(&root
->fs_info
->volume_mutex
);
1017 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1024 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
1025 struct file
*src_file
;
1029 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
1032 namelen
= strlen(name
);
1033 if (strchr(name
, '/')) {
1039 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1040 NULL
, transid
, readonly
);
1042 struct inode
*src_inode
;
1043 src_file
= fget(fd
);
1049 src_inode
= src_file
->f_path
.dentry
->d_inode
;
1050 if (src_inode
->i_sb
!= file
->f_path
.dentry
->d_inode
->i_sb
) {
1051 printk(KERN_INFO
"btrfs: Snapshot src from "
1057 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1058 BTRFS_I(src_inode
)->root
,
1066 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1067 void __user
*arg
, int subvol
)
1069 struct btrfs_ioctl_vol_args
*vol_args
;
1072 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1073 if (IS_ERR(vol_args
))
1074 return PTR_ERR(vol_args
);
1075 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1077 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1078 vol_args
->fd
, subvol
,
1085 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1086 void __user
*arg
, int subvol
)
1088 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1092 bool readonly
= false;
1094 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1095 if (IS_ERR(vol_args
))
1096 return PTR_ERR(vol_args
);
1097 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1099 if (vol_args
->flags
&
1100 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
)) {
1105 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1107 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1110 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1111 vol_args
->fd
, subvol
,
1114 if (ret
== 0 && ptr
&&
1116 offsetof(struct btrfs_ioctl_vol_args_v2
,
1117 transid
), ptr
, sizeof(*ptr
)))
1124 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1127 struct inode
*inode
= fdentry(file
)->d_inode
;
1128 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1132 if (inode
->i_ino
!= BTRFS_FIRST_FREE_OBJECTID
)
1135 down_read(&root
->fs_info
->subvol_sem
);
1136 if (btrfs_root_readonly(root
))
1137 flags
|= BTRFS_SUBVOL_RDONLY
;
1138 up_read(&root
->fs_info
->subvol_sem
);
1140 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1146 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1149 struct inode
*inode
= fdentry(file
)->d_inode
;
1150 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1151 struct btrfs_trans_handle
*trans
;
1156 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
1159 if (inode
->i_ino
!= BTRFS_FIRST_FREE_OBJECTID
)
1162 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
1165 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1168 if (flags
& ~BTRFS_SUBVOL_RDONLY
)
1171 if (!is_owner_or_cap(inode
))
1174 down_write(&root
->fs_info
->subvol_sem
);
1177 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1180 root_flags
= btrfs_root_flags(&root
->root_item
);
1181 if (flags
& BTRFS_SUBVOL_RDONLY
)
1182 btrfs_set_root_flags(&root
->root_item
,
1183 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1185 btrfs_set_root_flags(&root
->root_item
,
1186 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1188 trans
= btrfs_start_transaction(root
, 1);
1189 if (IS_ERR(trans
)) {
1190 ret
= PTR_ERR(trans
);
1194 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1195 &root
->root_key
, &root
->root_item
);
1197 btrfs_commit_transaction(trans
, root
);
1200 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1202 up_write(&root
->fs_info
->subvol_sem
);
1207 * helper to check if the subvolume references other subvolumes
1209 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1211 struct btrfs_path
*path
;
1212 struct btrfs_key key
;
1215 path
= btrfs_alloc_path();
1219 key
.objectid
= root
->root_key
.objectid
;
1220 key
.type
= BTRFS_ROOT_REF_KEY
;
1221 key
.offset
= (u64
)-1;
1223 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1230 if (path
->slots
[0] > 0) {
1232 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1233 if (key
.objectid
== root
->root_key
.objectid
&&
1234 key
.type
== BTRFS_ROOT_REF_KEY
)
1238 btrfs_free_path(path
);
1242 static noinline
int key_in_sk(struct btrfs_key
*key
,
1243 struct btrfs_ioctl_search_key
*sk
)
1245 struct btrfs_key test
;
1248 test
.objectid
= sk
->min_objectid
;
1249 test
.type
= sk
->min_type
;
1250 test
.offset
= sk
->min_offset
;
1252 ret
= btrfs_comp_cpu_keys(key
, &test
);
1256 test
.objectid
= sk
->max_objectid
;
1257 test
.type
= sk
->max_type
;
1258 test
.offset
= sk
->max_offset
;
1260 ret
= btrfs_comp_cpu_keys(key
, &test
);
1266 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1267 struct btrfs_path
*path
,
1268 struct btrfs_key
*key
,
1269 struct btrfs_ioctl_search_key
*sk
,
1271 unsigned long *sk_offset
,
1275 struct extent_buffer
*leaf
;
1276 struct btrfs_ioctl_search_header sh
;
1277 unsigned long item_off
;
1278 unsigned long item_len
;
1285 leaf
= path
->nodes
[0];
1286 slot
= path
->slots
[0];
1287 nritems
= btrfs_header_nritems(leaf
);
1289 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1293 found_transid
= btrfs_header_generation(leaf
);
1295 for (i
= slot
; i
< nritems
; i
++) {
1296 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1297 item_len
= btrfs_item_size_nr(leaf
, i
);
1299 if (item_len
> BTRFS_SEARCH_ARGS_BUFSIZE
)
1302 if (sizeof(sh
) + item_len
+ *sk_offset
>
1303 BTRFS_SEARCH_ARGS_BUFSIZE
) {
1308 btrfs_item_key_to_cpu(leaf
, key
, i
);
1309 if (!key_in_sk(key
, sk
))
1312 sh
.objectid
= key
->objectid
;
1313 sh
.offset
= key
->offset
;
1314 sh
.type
= key
->type
;
1316 sh
.transid
= found_transid
;
1318 /* copy search result header */
1319 memcpy(buf
+ *sk_offset
, &sh
, sizeof(sh
));
1320 *sk_offset
+= sizeof(sh
);
1323 char *p
= buf
+ *sk_offset
;
1325 read_extent_buffer(leaf
, p
,
1326 item_off
, item_len
);
1327 *sk_offset
+= item_len
;
1331 if (*num_found
>= sk
->nr_items
)
1336 if (key
->offset
< (u64
)-1 && key
->offset
< sk
->max_offset
)
1338 else if (key
->type
< (u8
)-1 && key
->type
< sk
->max_type
) {
1341 } else if (key
->objectid
< (u64
)-1 && key
->objectid
< sk
->max_objectid
) {
1348 *num_found
+= found
;
1352 static noinline
int search_ioctl(struct inode
*inode
,
1353 struct btrfs_ioctl_search_args
*args
)
1355 struct btrfs_root
*root
;
1356 struct btrfs_key key
;
1357 struct btrfs_key max_key
;
1358 struct btrfs_path
*path
;
1359 struct btrfs_ioctl_search_key
*sk
= &args
->key
;
1360 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
1363 unsigned long sk_offset
= 0;
1365 path
= btrfs_alloc_path();
1369 if (sk
->tree_id
== 0) {
1370 /* search the root of the inode that was passed */
1371 root
= BTRFS_I(inode
)->root
;
1373 key
.objectid
= sk
->tree_id
;
1374 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1375 key
.offset
= (u64
)-1;
1376 root
= btrfs_read_fs_root_no_name(info
, &key
);
1378 printk(KERN_ERR
"could not find root %llu\n",
1380 btrfs_free_path(path
);
1385 key
.objectid
= sk
->min_objectid
;
1386 key
.type
= sk
->min_type
;
1387 key
.offset
= sk
->min_offset
;
1389 max_key
.objectid
= sk
->max_objectid
;
1390 max_key
.type
= sk
->max_type
;
1391 max_key
.offset
= sk
->max_offset
;
1393 path
->keep_locks
= 1;
1396 ret
= btrfs_search_forward(root
, &key
, &max_key
, path
, 0,
1403 ret
= copy_to_sk(root
, path
, &key
, sk
, args
->buf
,
1404 &sk_offset
, &num_found
);
1405 btrfs_release_path(root
, path
);
1406 if (ret
|| num_found
>= sk
->nr_items
)
1412 sk
->nr_items
= num_found
;
1413 btrfs_free_path(path
);
1417 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
1420 struct btrfs_ioctl_search_args
*args
;
1421 struct inode
*inode
;
1424 if (!capable(CAP_SYS_ADMIN
))
1427 args
= memdup_user(argp
, sizeof(*args
));
1429 return PTR_ERR(args
);
1431 inode
= fdentry(file
)->d_inode
;
1432 ret
= search_ioctl(inode
, args
);
1433 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
1440 * Search INODE_REFs to identify path name of 'dirid' directory
1441 * in a 'tree_id' tree. and sets path name to 'name'.
1443 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
1444 u64 tree_id
, u64 dirid
, char *name
)
1446 struct btrfs_root
*root
;
1447 struct btrfs_key key
;
1453 struct btrfs_inode_ref
*iref
;
1454 struct extent_buffer
*l
;
1455 struct btrfs_path
*path
;
1457 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
1462 path
= btrfs_alloc_path();
1466 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
1468 key
.objectid
= tree_id
;
1469 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1470 key
.offset
= (u64
)-1;
1471 root
= btrfs_read_fs_root_no_name(info
, &key
);
1473 printk(KERN_ERR
"could not find root %llu\n", tree_id
);
1478 key
.objectid
= dirid
;
1479 key
.type
= BTRFS_INODE_REF_KEY
;
1480 key
.offset
= (u64
)-1;
1483 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1488 slot
= path
->slots
[0];
1489 if (ret
> 0 && slot
> 0)
1491 btrfs_item_key_to_cpu(l
, &key
, slot
);
1493 if (ret
> 0 && (key
.objectid
!= dirid
||
1494 key
.type
!= BTRFS_INODE_REF_KEY
)) {
1499 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
1500 len
= btrfs_inode_ref_name_len(l
, iref
);
1502 total_len
+= len
+ 1;
1507 read_extent_buffer(l
, ptr
,(unsigned long)(iref
+ 1), len
);
1509 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
1512 btrfs_release_path(root
, path
);
1513 key
.objectid
= key
.offset
;
1514 key
.offset
= (u64
)-1;
1515 dirid
= key
.objectid
;
1520 memcpy(name
, ptr
, total_len
);
1521 name
[total_len
]='\0';
1524 btrfs_free_path(path
);
1528 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
1531 struct btrfs_ioctl_ino_lookup_args
*args
;
1532 struct inode
*inode
;
1535 if (!capable(CAP_SYS_ADMIN
))
1538 args
= memdup_user(argp
, sizeof(*args
));
1540 return PTR_ERR(args
);
1542 inode
= fdentry(file
)->d_inode
;
1544 if (args
->treeid
== 0)
1545 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
1547 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
1548 args
->treeid
, args
->objectid
,
1551 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
1558 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
1561 struct dentry
*parent
= fdentry(file
);
1562 struct dentry
*dentry
;
1563 struct inode
*dir
= parent
->d_inode
;
1564 struct inode
*inode
;
1565 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1566 struct btrfs_root
*dest
= NULL
;
1567 struct btrfs_ioctl_vol_args
*vol_args
;
1568 struct btrfs_trans_handle
*trans
;
1573 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1574 if (IS_ERR(vol_args
))
1575 return PTR_ERR(vol_args
);
1577 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1578 namelen
= strlen(vol_args
->name
);
1579 if (strchr(vol_args
->name
, '/') ||
1580 strncmp(vol_args
->name
, "..", namelen
) == 0) {
1585 err
= mnt_want_write(file
->f_path
.mnt
);
1589 mutex_lock_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
1590 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
1591 if (IS_ERR(dentry
)) {
1592 err
= PTR_ERR(dentry
);
1593 goto out_unlock_dir
;
1596 if (!dentry
->d_inode
) {
1601 inode
= dentry
->d_inode
;
1602 dest
= BTRFS_I(inode
)->root
;
1603 if (!capable(CAP_SYS_ADMIN
)){
1605 * Regular user. Only allow this with a special mount
1606 * option, when the user has write+exec access to the
1607 * subvol root, and when rmdir(2) would have been
1610 * Note that this is _not_ check that the subvol is
1611 * empty or doesn't contain data that we wouldn't
1612 * otherwise be able to delete.
1614 * Users who want to delete empty subvols should try
1618 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
1622 * Do not allow deletion if the parent dir is the same
1623 * as the dir to be deleted. That means the ioctl
1624 * must be called on the dentry referencing the root
1625 * of the subvol, not a random directory contained
1632 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
1636 /* check if subvolume may be deleted by a non-root user */
1637 err
= btrfs_may_delete(dir
, dentry
, 1);
1642 if (inode
->i_ino
!= BTRFS_FIRST_FREE_OBJECTID
) {
1647 mutex_lock(&inode
->i_mutex
);
1648 err
= d_invalidate(dentry
);
1652 down_write(&root
->fs_info
->subvol_sem
);
1654 err
= may_destroy_subvol(dest
);
1658 trans
= btrfs_start_transaction(root
, 0);
1659 if (IS_ERR(trans
)) {
1660 err
= PTR_ERR(trans
);
1663 trans
->block_rsv
= &root
->fs_info
->global_block_rsv
;
1665 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
1666 dest
->root_key
.objectid
,
1667 dentry
->d_name
.name
,
1668 dentry
->d_name
.len
);
1671 btrfs_record_root_in_trans(trans
, dest
);
1673 memset(&dest
->root_item
.drop_progress
, 0,
1674 sizeof(dest
->root_item
.drop_progress
));
1675 dest
->root_item
.drop_level
= 0;
1676 btrfs_set_root_refs(&dest
->root_item
, 0);
1678 if (!xchg(&dest
->orphan_item_inserted
, 1)) {
1679 ret
= btrfs_insert_orphan_item(trans
,
1680 root
->fs_info
->tree_root
,
1681 dest
->root_key
.objectid
);
1685 ret
= btrfs_end_transaction(trans
, root
);
1687 inode
->i_flags
|= S_DEAD
;
1689 up_write(&root
->fs_info
->subvol_sem
);
1691 mutex_unlock(&inode
->i_mutex
);
1693 shrink_dcache_sb(root
->fs_info
->sb
);
1694 btrfs_invalidate_inodes(dest
);
1700 mutex_unlock(&dir
->i_mutex
);
1701 mnt_drop_write(file
->f_path
.mnt
);
1707 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
1709 struct inode
*inode
= fdentry(file
)->d_inode
;
1710 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1711 struct btrfs_ioctl_defrag_range_args
*range
;
1714 if (btrfs_root_readonly(root
))
1717 ret
= mnt_want_write(file
->f_path
.mnt
);
1721 switch (inode
->i_mode
& S_IFMT
) {
1723 if (!capable(CAP_SYS_ADMIN
)) {
1727 ret
= btrfs_defrag_root(root
, 0);
1730 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
1733 if (!(file
->f_mode
& FMODE_WRITE
)) {
1738 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
1745 if (copy_from_user(range
, argp
,
1751 /* compression requires us to start the IO */
1752 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1753 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
1754 range
->extent_thresh
= (u32
)-1;
1757 /* the rest are all set to zero by kzalloc */
1758 range
->len
= (u64
)-1;
1760 ret
= btrfs_defrag_file(file
, range
);
1767 mnt_drop_write(file
->f_path
.mnt
);
1771 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
1773 struct btrfs_ioctl_vol_args
*vol_args
;
1776 if (!capable(CAP_SYS_ADMIN
))
1779 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1780 if (IS_ERR(vol_args
))
1781 return PTR_ERR(vol_args
);
1783 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1784 ret
= btrfs_init_new_device(root
, vol_args
->name
);
1790 static long btrfs_ioctl_rm_dev(struct btrfs_root
*root
, void __user
*arg
)
1792 struct btrfs_ioctl_vol_args
*vol_args
;
1795 if (!capable(CAP_SYS_ADMIN
))
1798 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
1801 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1802 if (IS_ERR(vol_args
))
1803 return PTR_ERR(vol_args
);
1805 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1806 ret
= btrfs_rm_device(root
, vol_args
->name
);
1812 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
1813 u64 off
, u64 olen
, u64 destoff
)
1815 struct inode
*inode
= fdentry(file
)->d_inode
;
1816 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1817 struct file
*src_file
;
1819 struct btrfs_trans_handle
*trans
;
1820 struct btrfs_path
*path
;
1821 struct extent_buffer
*leaf
;
1823 struct btrfs_key key
;
1828 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
1833 * - split compressed inline extents. annoying: we need to
1834 * decompress into destination's address_space (the file offset
1835 * may change, so source mapping won't do), then recompress (or
1836 * otherwise reinsert) a subrange.
1837 * - allow ranges within the same file to be cloned (provided
1838 * they don't overlap)?
1841 /* the destination must be opened for writing */
1842 if (!(file
->f_mode
& FMODE_WRITE
) || (file
->f_flags
& O_APPEND
))
1845 if (btrfs_root_readonly(root
))
1848 ret
= mnt_want_write(file
->f_path
.mnt
);
1852 src_file
= fget(srcfd
);
1855 goto out_drop_write
;
1858 src
= src_file
->f_dentry
->d_inode
;
1864 /* the src must be open for reading */
1865 if (!(src_file
->f_mode
& FMODE_READ
))
1869 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
1873 if (src
->i_sb
!= inode
->i_sb
|| BTRFS_I(src
)->root
!= root
)
1877 buf
= vmalloc(btrfs_level_size(root
, 0));
1881 path
= btrfs_alloc_path();
1889 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_PARENT
);
1890 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_CHILD
);
1892 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_PARENT
);
1893 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_CHILD
);
1896 /* determine range to clone */
1898 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
1901 olen
= len
= src
->i_size
- off
;
1902 /* if we extend to eof, continue to block boundary */
1903 if (off
+ len
== src
->i_size
)
1904 len
= ALIGN(src
->i_size
, bs
) - off
;
1906 /* verify the end result is block aligned */
1907 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
1908 !IS_ALIGNED(destoff
, bs
))
1911 /* do any pending delalloc/csum calc on src, one way or
1912 another, and lock file content */
1914 struct btrfs_ordered_extent
*ordered
;
1915 lock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
1916 ordered
= btrfs_lookup_first_ordered_extent(src
, off
+len
);
1918 !test_range_bit(&BTRFS_I(src
)->io_tree
, off
, off
+len
,
1919 EXTENT_DELALLOC
, 0, NULL
))
1921 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
1923 btrfs_put_ordered_extent(ordered
);
1924 btrfs_wait_ordered_range(src
, off
, len
);
1928 key
.objectid
= src
->i_ino
;
1929 key
.type
= BTRFS_EXTENT_DATA_KEY
;
1934 * note the key will change type as we walk through the
1937 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1941 nritems
= btrfs_header_nritems(path
->nodes
[0]);
1942 if (path
->slots
[0] >= nritems
) {
1943 ret
= btrfs_next_leaf(root
, path
);
1948 nritems
= btrfs_header_nritems(path
->nodes
[0]);
1950 leaf
= path
->nodes
[0];
1951 slot
= path
->slots
[0];
1953 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1954 if (btrfs_key_type(&key
) > BTRFS_EXTENT_DATA_KEY
||
1955 key
.objectid
!= src
->i_ino
)
1958 if (btrfs_key_type(&key
) == BTRFS_EXTENT_DATA_KEY
) {
1959 struct btrfs_file_extent_item
*extent
;
1962 struct btrfs_key new_key
;
1963 u64 disko
= 0, diskl
= 0;
1964 u64 datao
= 0, datal
= 0;
1968 size
= btrfs_item_size_nr(leaf
, slot
);
1969 read_extent_buffer(leaf
, buf
,
1970 btrfs_item_ptr_offset(leaf
, slot
),
1973 extent
= btrfs_item_ptr(leaf
, slot
,
1974 struct btrfs_file_extent_item
);
1975 comp
= btrfs_file_extent_compression(leaf
, extent
);
1976 type
= btrfs_file_extent_type(leaf
, extent
);
1977 if (type
== BTRFS_FILE_EXTENT_REG
||
1978 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1979 disko
= btrfs_file_extent_disk_bytenr(leaf
,
1981 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
1983 datao
= btrfs_file_extent_offset(leaf
, extent
);
1984 datal
= btrfs_file_extent_num_bytes(leaf
,
1986 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
1987 /* take upper bound, may be compressed */
1988 datal
= btrfs_file_extent_ram_bytes(leaf
,
1991 btrfs_release_path(root
, path
);
1993 if (key
.offset
+ datal
<= off
||
1994 key
.offset
>= off
+len
)
1997 memcpy(&new_key
, &key
, sizeof(new_key
));
1998 new_key
.objectid
= inode
->i_ino
;
1999 if (off
<= key
.offset
)
2000 new_key
.offset
= key
.offset
+ destoff
- off
;
2002 new_key
.offset
= destoff
;
2004 trans
= btrfs_start_transaction(root
, 1);
2005 if (IS_ERR(trans
)) {
2006 ret
= PTR_ERR(trans
);
2010 if (type
== BTRFS_FILE_EXTENT_REG
||
2011 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
2012 if (off
> key
.offset
) {
2013 datao
+= off
- key
.offset
;
2014 datal
-= off
- key
.offset
;
2017 if (key
.offset
+ datal
> off
+ len
)
2018 datal
= off
+ len
- key
.offset
;
2020 ret
= btrfs_drop_extents(trans
, inode
,
2022 new_key
.offset
+ datal
,
2026 ret
= btrfs_insert_empty_item(trans
, root
, path
,
2030 leaf
= path
->nodes
[0];
2031 slot
= path
->slots
[0];
2032 write_extent_buffer(leaf
, buf
,
2033 btrfs_item_ptr_offset(leaf
, slot
),
2036 extent
= btrfs_item_ptr(leaf
, slot
,
2037 struct btrfs_file_extent_item
);
2039 /* disko == 0 means it's a hole */
2043 btrfs_set_file_extent_offset(leaf
, extent
,
2045 btrfs_set_file_extent_num_bytes(leaf
, extent
,
2048 inode_add_bytes(inode
, datal
);
2049 ret
= btrfs_inc_extent_ref(trans
, root
,
2051 root
->root_key
.objectid
,
2053 new_key
.offset
- datao
);
2056 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
2059 if (off
> key
.offset
) {
2060 skip
= off
- key
.offset
;
2061 new_key
.offset
+= skip
;
2064 if (key
.offset
+ datal
> off
+len
)
2065 trim
= key
.offset
+ datal
- (off
+len
);
2067 if (comp
&& (skip
|| trim
)) {
2069 btrfs_end_transaction(trans
, root
);
2072 size
-= skip
+ trim
;
2073 datal
-= skip
+ trim
;
2075 ret
= btrfs_drop_extents(trans
, inode
,
2077 new_key
.offset
+ datal
,
2081 ret
= btrfs_insert_empty_item(trans
, root
, path
,
2087 btrfs_file_extent_calc_inline_size(0);
2088 memmove(buf
+start
, buf
+start
+skip
,
2092 leaf
= path
->nodes
[0];
2093 slot
= path
->slots
[0];
2094 write_extent_buffer(leaf
, buf
,
2095 btrfs_item_ptr_offset(leaf
, slot
),
2097 inode_add_bytes(inode
, datal
);
2100 btrfs_mark_buffer_dirty(leaf
);
2101 btrfs_release_path(root
, path
);
2103 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
2106 * we round up to the block size at eof when
2107 * determining which extents to clone above,
2108 * but shouldn't round up the file size
2110 endoff
= new_key
.offset
+ datal
;
2111 if (endoff
> destoff
+olen
)
2112 endoff
= destoff
+olen
;
2113 if (endoff
> inode
->i_size
)
2114 btrfs_i_size_write(inode
, endoff
);
2116 BTRFS_I(inode
)->flags
= BTRFS_I(src
)->flags
;
2117 ret
= btrfs_update_inode(trans
, root
, inode
);
2119 btrfs_end_transaction(trans
, root
);
2122 btrfs_release_path(root
, path
);
2127 btrfs_release_path(root
, path
);
2128 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
2130 mutex_unlock(&src
->i_mutex
);
2131 mutex_unlock(&inode
->i_mutex
);
2133 btrfs_free_path(path
);
2137 mnt_drop_write(file
->f_path
.mnt
);
2141 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
2143 struct btrfs_ioctl_clone_range_args args
;
2145 if (copy_from_user(&args
, argp
, sizeof(args
)))
2147 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
2148 args
.src_length
, args
.dest_offset
);
2152 * there are many ways the trans_start and trans_end ioctls can lead
2153 * to deadlocks. They should only be used by applications that
2154 * basically own the machine, and have a very in depth understanding
2155 * of all the possible deadlocks and enospc problems.
2157 static long btrfs_ioctl_trans_start(struct file
*file
)
2159 struct inode
*inode
= fdentry(file
)->d_inode
;
2160 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2161 struct btrfs_trans_handle
*trans
;
2165 if (!capable(CAP_SYS_ADMIN
))
2169 if (file
->private_data
)
2173 if (btrfs_root_readonly(root
))
2176 ret
= mnt_want_write(file
->f_path
.mnt
);
2180 mutex_lock(&root
->fs_info
->trans_mutex
);
2181 root
->fs_info
->open_ioctl_trans
++;
2182 mutex_unlock(&root
->fs_info
->trans_mutex
);
2185 trans
= btrfs_start_ioctl_transaction(root
, 0);
2189 file
->private_data
= trans
;
2193 mutex_lock(&root
->fs_info
->trans_mutex
);
2194 root
->fs_info
->open_ioctl_trans
--;
2195 mutex_unlock(&root
->fs_info
->trans_mutex
);
2196 mnt_drop_write(file
->f_path
.mnt
);
2201 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
2203 struct inode
*inode
= fdentry(file
)->d_inode
;
2204 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2205 struct btrfs_root
*new_root
;
2206 struct btrfs_dir_item
*di
;
2207 struct btrfs_trans_handle
*trans
;
2208 struct btrfs_path
*path
;
2209 struct btrfs_key location
;
2210 struct btrfs_disk_key disk_key
;
2211 struct btrfs_super_block
*disk_super
;
2216 if (!capable(CAP_SYS_ADMIN
))
2219 if (copy_from_user(&objectid
, argp
, sizeof(objectid
)))
2223 objectid
= root
->root_key
.objectid
;
2225 location
.objectid
= objectid
;
2226 location
.type
= BTRFS_ROOT_ITEM_KEY
;
2227 location
.offset
= (u64
)-1;
2229 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
2230 if (IS_ERR(new_root
))
2231 return PTR_ERR(new_root
);
2233 if (btrfs_root_refs(&new_root
->root_item
) == 0)
2236 path
= btrfs_alloc_path();
2239 path
->leave_spinning
= 1;
2241 trans
= btrfs_start_transaction(root
, 1);
2242 if (IS_ERR(trans
)) {
2243 btrfs_free_path(path
);
2244 return PTR_ERR(trans
);
2247 dir_id
= btrfs_super_root_dir(&root
->fs_info
->super_copy
);
2248 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
2249 dir_id
, "default", 7, 1);
2250 if (IS_ERR_OR_NULL(di
)) {
2251 btrfs_free_path(path
);
2252 btrfs_end_transaction(trans
, root
);
2253 printk(KERN_ERR
"Umm, you don't have the default dir item, "
2254 "this isn't going to work\n");
2258 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
2259 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
2260 btrfs_mark_buffer_dirty(path
->nodes
[0]);
2261 btrfs_free_path(path
);
2263 disk_super
= &root
->fs_info
->super_copy
;
2264 features
= btrfs_super_incompat_flags(disk_super
);
2265 if (!(features
& BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL
)) {
2266 features
|= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL
;
2267 btrfs_set_super_incompat_flags(disk_super
, features
);
2269 btrfs_end_transaction(trans
, root
);
2274 static void get_block_group_info(struct list_head
*groups_list
,
2275 struct btrfs_ioctl_space_info
*space
)
2277 struct btrfs_block_group_cache
*block_group
;
2279 space
->total_bytes
= 0;
2280 space
->used_bytes
= 0;
2282 list_for_each_entry(block_group
, groups_list
, list
) {
2283 space
->flags
= block_group
->flags
;
2284 space
->total_bytes
+= block_group
->key
.offset
;
2285 space
->used_bytes
+=
2286 btrfs_block_group_used(&block_group
->item
);
2290 long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
2292 struct btrfs_ioctl_space_args space_args
;
2293 struct btrfs_ioctl_space_info space
;
2294 struct btrfs_ioctl_space_info
*dest
;
2295 struct btrfs_ioctl_space_info
*dest_orig
;
2296 struct btrfs_ioctl_space_info __user
*user_dest
;
2297 struct btrfs_space_info
*info
;
2298 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
2299 BTRFS_BLOCK_GROUP_SYSTEM
,
2300 BTRFS_BLOCK_GROUP_METADATA
,
2301 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
2308 if (copy_from_user(&space_args
,
2309 (struct btrfs_ioctl_space_args __user
*)arg
,
2310 sizeof(space_args
)))
2313 for (i
= 0; i
< num_types
; i
++) {
2314 struct btrfs_space_info
*tmp
;
2318 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
2320 if (tmp
->flags
== types
[i
]) {
2330 down_read(&info
->groups_sem
);
2331 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
2332 if (!list_empty(&info
->block_groups
[c
]))
2335 up_read(&info
->groups_sem
);
2338 /* space_slots == 0 means they are asking for a count */
2339 if (space_args
.space_slots
== 0) {
2340 space_args
.total_spaces
= slot_count
;
2344 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
2346 alloc_size
= sizeof(*dest
) * slot_count
;
2348 /* we generally have at most 6 or so space infos, one for each raid
2349 * level. So, a whole page should be more than enough for everyone
2351 if (alloc_size
> PAGE_CACHE_SIZE
)
2354 space_args
.total_spaces
= 0;
2355 dest
= kmalloc(alloc_size
, GFP_NOFS
);
2360 /* now we have a buffer to copy into */
2361 for (i
= 0; i
< num_types
; i
++) {
2362 struct btrfs_space_info
*tmp
;
2369 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
2371 if (tmp
->flags
== types
[i
]) {
2380 down_read(&info
->groups_sem
);
2381 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
2382 if (!list_empty(&info
->block_groups
[c
])) {
2383 get_block_group_info(&info
->block_groups
[c
],
2385 memcpy(dest
, &space
, sizeof(space
));
2387 space_args
.total_spaces
++;
2393 up_read(&info
->groups_sem
);
2396 user_dest
= (struct btrfs_ioctl_space_info
*)
2397 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
2399 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
2404 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
2411 * there are many ways the trans_start and trans_end ioctls can lead
2412 * to deadlocks. They should only be used by applications that
2413 * basically own the machine, and have a very in depth understanding
2414 * of all the possible deadlocks and enospc problems.
2416 long btrfs_ioctl_trans_end(struct file
*file
)
2418 struct inode
*inode
= fdentry(file
)->d_inode
;
2419 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2420 struct btrfs_trans_handle
*trans
;
2422 trans
= file
->private_data
;
2425 file
->private_data
= NULL
;
2427 btrfs_end_transaction(trans
, root
);
2429 mutex_lock(&root
->fs_info
->trans_mutex
);
2430 root
->fs_info
->open_ioctl_trans
--;
2431 mutex_unlock(&root
->fs_info
->trans_mutex
);
2433 mnt_drop_write(file
->f_path
.mnt
);
2437 static noinline
long btrfs_ioctl_start_sync(struct file
*file
, void __user
*argp
)
2439 struct btrfs_root
*root
= BTRFS_I(file
->f_dentry
->d_inode
)->root
;
2440 struct btrfs_trans_handle
*trans
;
2444 trans
= btrfs_start_transaction(root
, 0);
2446 return PTR_ERR(trans
);
2447 transid
= trans
->transid
;
2448 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
2450 btrfs_end_transaction(trans
, root
);
2455 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
2460 static noinline
long btrfs_ioctl_wait_sync(struct file
*file
, void __user
*argp
)
2462 struct btrfs_root
*root
= BTRFS_I(file
->f_dentry
->d_inode
)->root
;
2466 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
2469 transid
= 0; /* current trans */
2471 return btrfs_wait_for_commit(root
, transid
);
2474 long btrfs_ioctl(struct file
*file
, unsigned int
2475 cmd
, unsigned long arg
)
2477 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2478 void __user
*argp
= (void __user
*)arg
;
2481 case FS_IOC_GETFLAGS
:
2482 return btrfs_ioctl_getflags(file
, argp
);
2483 case FS_IOC_SETFLAGS
:
2484 return btrfs_ioctl_setflags(file
, argp
);
2485 case FS_IOC_GETVERSION
:
2486 return btrfs_ioctl_getversion(file
, argp
);
2488 return btrfs_ioctl_fitrim(file
, argp
);
2489 case BTRFS_IOC_SNAP_CREATE
:
2490 return btrfs_ioctl_snap_create(file
, argp
, 0);
2491 case BTRFS_IOC_SNAP_CREATE_V2
:
2492 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
2493 case BTRFS_IOC_SUBVOL_CREATE
:
2494 return btrfs_ioctl_snap_create(file
, argp
, 1);
2495 case BTRFS_IOC_SNAP_DESTROY
:
2496 return btrfs_ioctl_snap_destroy(file
, argp
);
2497 case BTRFS_IOC_SUBVOL_GETFLAGS
:
2498 return btrfs_ioctl_subvol_getflags(file
, argp
);
2499 case BTRFS_IOC_SUBVOL_SETFLAGS
:
2500 return btrfs_ioctl_subvol_setflags(file
, argp
);
2501 case BTRFS_IOC_DEFAULT_SUBVOL
:
2502 return btrfs_ioctl_default_subvol(file
, argp
);
2503 case BTRFS_IOC_DEFRAG
:
2504 return btrfs_ioctl_defrag(file
, NULL
);
2505 case BTRFS_IOC_DEFRAG_RANGE
:
2506 return btrfs_ioctl_defrag(file
, argp
);
2507 case BTRFS_IOC_RESIZE
:
2508 return btrfs_ioctl_resize(root
, argp
);
2509 case BTRFS_IOC_ADD_DEV
:
2510 return btrfs_ioctl_add_dev(root
, argp
);
2511 case BTRFS_IOC_RM_DEV
:
2512 return btrfs_ioctl_rm_dev(root
, argp
);
2513 case BTRFS_IOC_BALANCE
:
2514 return btrfs_balance(root
->fs_info
->dev_root
);
2515 case BTRFS_IOC_CLONE
:
2516 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
2517 case BTRFS_IOC_CLONE_RANGE
:
2518 return btrfs_ioctl_clone_range(file
, argp
);
2519 case BTRFS_IOC_TRANS_START
:
2520 return btrfs_ioctl_trans_start(file
);
2521 case BTRFS_IOC_TRANS_END
:
2522 return btrfs_ioctl_trans_end(file
);
2523 case BTRFS_IOC_TREE_SEARCH
:
2524 return btrfs_ioctl_tree_search(file
, argp
);
2525 case BTRFS_IOC_INO_LOOKUP
:
2526 return btrfs_ioctl_ino_lookup(file
, argp
);
2527 case BTRFS_IOC_SPACE_INFO
:
2528 return btrfs_ioctl_space_info(root
, argp
);
2529 case BTRFS_IOC_SYNC
:
2530 btrfs_sync_fs(file
->f_dentry
->d_sb
, 1);
2532 case BTRFS_IOC_START_SYNC
:
2533 return btrfs_ioctl_start_sync(file
, argp
);
2534 case BTRFS_IOC_WAIT_SYNC
:
2535 return btrfs_ioctl_wait_sync(file
, argp
);